Artificial stone.



UNTTED STATES PATENT OFFICE.

ALBERT HENDRIK VAN DER VIJGH, HENDRIK VAN DER VIJGH, AND GER- HARD VAN DER VIJGH, AMSTERDAM, NETHERLANDS.

ARTIFICIAL STONE.

SEECIFICATION forming part of Letters Patent N 0. 632,482, dated September 5, 1899.

Application filed April 11, 1899. Serial No. 712,646. (No specimens.)

To all whom it may concern:

Be it known that we, ALBERT HENDEI'K VAN DER VIJGH, HENDRIX VAN DER VIJGH, and GERHARD VAN DER VIJGH, subjects of the Queen of Holland, residing at Amsterdam, Netherlands, have invented new and useful Improvementsin the Manufacture of Artificial Stone, (for which we have applied for a patent in Great Britain, No. 23,159, dated November 3, 1898,) of which the following is measure or volume: pumice-stone, twenty parts; slag-sand, ten parts; lime, (preferably hydraulic,) eighteen parts; tan, (spent or unspent,) twelve parts; plaster-of-paris, twenty parts; water, twenty parts; total, one hundred parts.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what We claim is- The herein-described composition for the manufacture of artificial stone, consisting of pumice-stone, slag-sand, lime, tan, plasterof-paris and Water combined in substantially the proportions specified.

ALBERT HENDRIX VAN DER YIJGH. HENDRIX VAN DER VIJGH. GERHARD VAN DER VIJGH. Witnesses:

ALBERT GAREL WILLIUH, Jr., J AS. MILLINE. 

